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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 2
31.
In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is
0 ≤ a ≤ 180°
0 ≤ a ≤ 150°
0 ≤ a ≤ 120°
0 ≤ a ≤ 90°
Answer: Option
Explanation:

Since output voltage is zero if a ≥ 150°, the possible range of firing angles is 0 ≤ a ≤ 150°.

32.

Assertion (A): A dual converter may be circulating current type or non circulating current type.

Reason (R): In circulating current dual converter only one converter can be operated at one time.

Both A and R are correct and R is correct explanation of A
Both A and R correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:

In circulating current dual converter both converters operate together.

33.
Current chopping leads to
over voltage
over current
both over voltage and over current
either over voltage or over current
Answer: Option
Explanation:

e = L . In current chopping is high. Hence e is high.

34.
A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of load current is
40 A
20 A
10 A
5 A
Answer: Option
Explanation:

Two resistances are in series at any time.

35.
In an SCR, the anode current is controlled by
gate current only
external circuit only
both gate current and external circuit
none of the above
Answer: Option
Explanation:

Once SCR has been triggered the gate has no control. Only external resistance controls the anode current.

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